52 lines
966 B
Go
52 lines
966 B
Go
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package tins2020
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import (
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"fmt"
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"time"
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"github.com/veandco/go-sdl2/sdl"
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)
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type FPS struct {
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ControlBase
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start time.Time
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stamp time.Duration
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slot int
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ticks []int
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total int
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}
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func (f *FPS) Init(*Context) error {
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f.start = time.Now()
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f.stamp = 0
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f.ticks = make([]int, 51)
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return nil
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}
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func (f *FPS) Render(ctx *Context) {
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elapsed := time.Since(f.start)
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stamp := elapsed / (20 * time.Millisecond)
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for f.stamp < stamp {
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f.total += f.ticks[f.slot]
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f.slot = (f.slot + 1) % len(f.ticks)
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f.total -= f.ticks[f.slot]
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f.ticks[f.slot] = 0
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f.stamp++
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}
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f.ticks[f.slot]++
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font := ctx.Fonts.Font("debug")
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surface, err := font.RenderUTF8Solid(fmt.Sprintf("FPS: %d", f.total), sdl.Color{R: 255, G: 255, B: 255, A: 255})
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if err != nil {
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return
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}
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defer surface.Free()
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texture, err := NewTextureFromSurface(ctx.Renderer, surface)
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if err != nil {
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return
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}
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defer texture.Destroy()
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texture.Copy(ctx.Renderer, texture.RectOffset(Pt(5, 5)))
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}
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